Finding the Fourth Proportional to 1,661.36, 2,292.59 and 915.30

Step by Step Solution

1. Step 1: Write the proportion equation
   1,661.36 : 2,292.59 = 915.30 : x
2. Step 2: Convert to fraction form
   1,661.36/2,292.59 = 915.30/x
3. Step 3: Cross multiply
   1,661.36x = 2,292.59 × 915.30
4. Step 4: Simplify right side
   1,661.36x = 2,098,391.59
5. Step 5: Solve for x
   x = 2,098,391.59/1,661.36
6. Step 6: Final answer
   x = 1,263.06